Lt Bambridge passed out of Sandhurst last April before going on the Platoon Commanders Battle Course in Brecon, South Wales. He used the training he had received for treating battlefield trauma wounds to help those who had been attacked, with injuries that were not to dissimilar.

He said: “I was walking covered in blood, walking back into it where there had been a shooting and my girlfriend was right in the middle of it.

“It was a real moment of bloody hell. I was walking back from the theatre a minute ago after a lovely night out.”

He added: “Trauma first aid, whether it be on the battlefield or streets of London, it’s what we’re trained for. In this scenario, there’s nobody better than the military.”